Husband leaving house to wife 2 after being given it by wife 1

Wife1 & husband jointly owned house etc. Have 1 son & 2 daughters, all married & having their own children. On wife1 passing away, she had in her will left her share to her husband (i.e house etc).
Husband remarried. Husband has left in his will (the house etc) to wife2.

1. What is the shariah ruling regarding above situation?

2. If husband mentioned the house for wife2 while he was alive?

3. How, if possible, could provision be made for husband & wife1 missed salaah etc (qaaza)?
Jazakallah